Electrical transport and thermoelectric properties of Ca<subscript>0.8</subscript>Y<subscript>0.2− x</subscript>Dy<subscript> x</subscript>MnO<subscript>3−δ</subscript> (0 ≤ x ≤ 0.2).

Ca0.8Y0.2− xDy xMnO3−δ (0≤ x≤0.2) samples were fabricated by the solid-state reaction method, and their thermoelectric properties were studied from 500°C to 800°C. Upon the substitution of Dy3+ for Y3+ in the Ca0.8Y0.2− xDy xMnO3−δ, the electrical and thermal conductivities gradually decreased with increasing Dy3+ concentration, whereas the absolute value of the Seebeck coefficient significantly increased. The Ca0.8Dy0.2MnO3−δ showed the largest value of dimensionless figure of merit (0.180) at 800°C as a result of the combination of the largest absolute value of the Seebeck coefficient and the lowest thermal conductivity. We believe that the Ca0.8Dy0.2MnO3−δ is a promising thermoelectric material at high temperatures. [ABSTRACT FROM AUTHOR]